Attrs: valid entries, list of variables?

Does anyone know where i can find a list of all the items that can be used in “attrs” field on the propeller head of the column tab in a view?

i know some from the mail template like

$TypeHeaderIcon=index:colicon1:29,

$MaskSelectionColor=true,

$ShowGradientColor=true,

$ShowGray=false,

$ReadToUnreadMap=index:colicon1:210<>index:colicon1:187

really fun to play with, thanks